Burner mounting for furnaces



June 13, 1950 w. A. MORTON BURNER MOUNTING FOR FURNACES 2 Sheets-Sheet 1Filed Juhe 12, 194:5

R P V O T O N w m A x .6 W H A/ W N mm N NH June 13, 1950 w. A. MORTONBURNER MOUNTING FOR FURNACES 2 Sheets-Sheet 2 Filed June 12, 1943 I 1 v1 1/ l 1 1 I A 1 1 1 I/ II ,1 I/

' INVENTOR MW/ZSVWA Morita/7 Patented June 13, 1950 William A. Morton,Mount Lebanon, Pa.,assignor,

. by mesne assignments, to Manufacturers Trading Corporation, Cleveland,Ohio, a corporation of Delaware Application June 12, 1943," Serial No.490,586

4 Claims. (014G543).

This invention relates to furnaces and, in particular, to a furnace forheating material such as slabs or the like, for example.

Furnaces for progressively heating material such as slabs, have beenvariously constructed heretofore but all the types with which I amfamiliar have several serious disadvantages. In such furnaces it hasbeen customary to provide burners firing longitudinally of the furnace,the burners being disposed near the roof of the furnace at one end,distributed across the width thereof in side by side relation, and soinclined that the burner center line strikes the furnace hearth adjacentthe median transverse plane therethrough. This elevated location of theburner is made necessary by the type of the supporting structure whichcarries the burners and associated parts. It increases the amount ofmaterial required in construction and requires a long flue for supplyingpreheated air to the burnvers formixture with the fuel. The considerablelength of the hot-air flue involves an excessive .drop in the pressureof the air at the point of wiping action over the mass, of material tobe heated. On the contrary, the flame strikes the material in arelatively restricted area and is then deflected up toward the furnaceroof. This produces aconcentration of heat and frequently results inoverheating the material with the formation of an excessive amount ofscale in the case of steel slabs. A further disadvantage is that theflame and the material to be heated are widely separated at the enteringend of the furnace. As a result the material has to travel aconsiderable distance along the furnace before being subjected to directheating. A still further disadvantage is the excessive pressure of gasesin the furnace, e. g., .08" of water, which opposes the air supplied tothe furnace through the burners.

I have invented a novel furnace construction which largely overcomes theaforementioned objections to forms of construction previously known.- Ina preferred embodiment, I provide a furnace having a roof, walls, and ahearth adapted to receive the material to be heated. The furnace mayconveniently'be of the continuous type in which the material is chargedcold at one end, pushed through the furnace step by step and graduallyheated, and-finally discharged from the other end. I provide a series ofhollow panels of metal plate disposed horizontally and extending alongone wall of the furnace, spaced vertically from the hearth. The panelsmay conveniently be placed across one end of the furnace, e. g., theentering end, and in this case, the panels are placed high enough abovethe hearth to permit the introduction therebetween of the material to beheated.

I construct .a plurality of burner cells on the horizontal panels whichserve as a supporting floor or deck for the burner structure. The panelsare supported from above, preferably on means depending from beamsextending across the furnace above the burners. The means suspendingathepanels may conveniently be pipes communicating with the interior thereofadapted togcirculate cooling water therethrough. A flue forsupplying-hot air to the burners is disposed on the cells andcommunicates therewith. Each cell-has a-fuel-supply pipe projectingthereinto and a mouth for supplying combustible to the furnace. Theburner structure actually replaces the wall of the furnace at the endwhere the burners are located, the roof adjacent the burners beingsloped downwardly to the top of the-burner mouths and the space betweenthe burner-supporting panels and the hearth being closed by asuitabledoor.

Further details, novel features and advantages of the invention will bemade clear by the following complete description and explanation whichrefer to the accompanying drawings illustrating the preferred embodimentreferred to above... In the drawings,

Figure 1 is a partial longitudinal section taken centrally through afurnace embodying the invention; T

Figure 2 is a partial transverse section taken along the planeof lineII-II of Figure 1; and Figure 3 shows a portion of Figure 2 to enlargedscale.-- s l Referring now in detail to the drawings a furnace indicatedgenerally at Ill comprises a hearth f l |-,;a main roof portion l2 andwalls one of which .is indicated at Ill. .The furnace is .built upinside an enclosure of structural members and metal plate. The hearth iscarried on beams l4 extending between suitable foundations (not shown),.and the space below the hearth is occupied by a recuperator, a portionof which is indicated at I5 whereby preheated air is supplied to thefurnace for combustion therein. The main roof portion I2 is suspendedfrom channels l6 carried on beams l'l extending across the furnace above'the roof and supported on suitable columns (not shown). Brackets l8secured to the channels l6 engage the lower flanges of the beam I! tosuspend the channels thereon.

Hollow panels 19 of metal plate. are disposed horirontallyv across oneend of the furnace. These panels aresuspended onpipes 20 and 2| carriedon beams 22 extending across the furnace above the end thereof. Thepipes 20 and 2| are 4 thus acts as a flared extension of the mouthsthereof. A further advantagewofgmy invention is that'ctheloadtrepresented by the-furnace roof is supported independently of thewater-cooled Burner cells 25 are constructed on the panls' vli Spanelswhich carry the burner cells and hot air I 9 as a supporting floor ordeck. The-cellsjS are disposed side by side as shown in Fi'gure 2,

extend across the end of theare separated by division walls 75. Eah'c'ellfhas am fuel supply pipe 25' projecting' thrinto andis formed witha discharge mouth or port 21 from which combustible flows intoztheinteri'ormfthe furnace. adjacent the burner cells whichslopes"'down-' wardly to the level of the tops of the mouths 21.

'A hot-a-ir flue 294s builtup "on the cells and "opens directly'thereintoat-i ts bottom. "Slidable damper plates 34] are'providedtocontrolthe volume of air flow-ing'through-the "several burner cells. Theflue 29 extends across theen'd of the furnace and connects' withavertical fiue 3i communicatin-g with the recuperator 'below*the'fur-'nace hearth. whe fl-u'e iil is carried' 'partly on the burner cells andpartly on hangers "32 de- =pending-from-the beams 22. I

It 'will be pbserve'd that the burner cells take the place ofthe'vertical wall of the furnace at the end -or-side Wherethey areinstalled-as the case'ma be. 'In-the particular embodimentdescribed, theburner cells-are installed across one heated such as slabs. The panels I9 are protected *from the heat "of the furnace by a layer of insulation33 app'lied 'thereto in plastic form and held in place by ke'y' angles34 welded to thebottom plates of the'panels. liftabl-e door 35 normallycloses the endofthefurnacebetween 'the'panels Ill-and thehearth. a

It will be apparent'from the foregoing-description that a furnaceconstructed in accordance with my inventionh'a's numerous advantages"over heating furnaces as'previously constructed. "In the first place,the burnersi-nmyponstruction are disposed much closer'to the hearththanthe burners of known typesof furnaces. This results in economy in theuse of materials, i. e., firebrick, metal plate and structural members,and1a1so 're duces the load on the supporting structure. Bydisposing'the burners as shown, "the flame discharged thereby is broughtdown closer to the material. thus increasing the rate of'trans'fer ofheat to the latter. theff urnace hearth in proximity to the material,provides a wiping action effective to displace the static colder gasesadjacent the surfaces 'of the material and increasing the heafingrate.The position of the burners also avoids impingement of the flame on aconcentrated area of the material and thus -'prevents local overheating;

p The construction disclosed'results ina'marke'd fliminution of thepressure in'the furnace opposing the infiowing combustible. The furnaceof :my invention is characterized by a gas pressure .of only about .03"of water in comparisonto 508" of water "for furnaces of knownconstruction.

My furnace isfurther characterizedby improved The furnace roof includesa portion 28 The flow of combustible along flue.

'Although'I have illustrated and described but rapneafier-red embodimentof my invention, it will be combustion at the charging'end when theburners are installed thereat because the heated roof surface'is therebybrought into proximity witha'cone --of combustible issuing from theburner I cells and recognize'd that changes in the constructiondisclosed'maybemade Without departing from the spirit of the inventionor the scope of the apgrended claims.

I claim:

In a furnace, a hearth, side walls and a roof, a series of water-cooledpanels spaced above the "hearth at'oneend ofthe furnace defining acharg- 'ing opening-nude series of burner ports disposed side by sideacrossitheendhf .thefurnace 'on-said panels, 'said bur'ner .ports being'at a .level subistantially below the;mainzporti-on of the roof, anddirected:horizontallyabove-the 2hearth,1and-means supplying amombustible mixture to the "burner ports includingzancatirsdnctzextendingacrosstsaid endpffdihe furnace above the ports.

2. 'SIn aicontinuouszfurnace for. heating material :charged into :onetend thereof rand moved therealpng, -a':hearth,.-Lside walls, anda'ro'of spaced above the hearth, a:sup.porting -=deck of Watercooledpanelrswdisposed horizontally above the hearth at 10118:8115110176'118furnace, burner ports "built up (in-"said cleck, "said ports :beingdisposed =s'itle by-side at- 'af level below the: main portion of theroof-andfiringalongitudinally of the furnace, :and a roofsections'loping upwardly. from the tops oftheports tosaid main portionofft'he' roof.

3.* In=a furnace, aEhearth, side walls and armor", a series ofsubstantially "horizontal water-cooled panels spaced ab'ove th'ehearth-at one end of the furnace forming a "hollow water-cooled lintel"above a charging openin-gga seri'es of. burner ports disposed side byside across the'end of the "furnace and'built upon saidpanels, an'dmeansfor supporting saidpanels independently of said roof.

4. Ina furnace, a'hearth, side walls .and a'roof, "a series ofwater-cooled panels #spacedabove the hearth at one'end of thefurnaceforminga segmental hollow water-cooledr lin'tel above a charg- "ingopening a series or burner ports disposed side by side across the end:ofthefurnace upon the panels, said ports being directed in .a .planesubstantially paralleT'to the furnace hearth, and means forsupportingsaid panels independently of the roof.

' -WILLIAM A. MORTON.

PREFERENCES (ELTED "The following references are of record in the fileof this'patent:

xtmrtrno smras PATENTS --Longenecker Dec. 5, 19-39 OTHER' REFERENCES.Trinks; .Industrial Furnaces," Zndedition, .vol. v.2,11942,publishedbyalohn Wiley .& Sons, pages

